htnut,
All you need to do is check the cowling (the metal engine cover) and it will have numbers stamped in it Model Type Code(either above the spark plug or on the exhaust side). The engine should be a 5hp I/C engine.

Thanks Bruce. It is a 5HP I/C. I finally found the code very well camouflaged behind the air cleaner. The code is 132432-0214-01. I managed to download a parts list from the Briggs & Stratton site but could not find any repair or operating manuals.
I am a novice when it comes to engines so any additional information will be most useful. Please could you point me in the right direction?